Reconstruction methods for phase-contrast tomography
Phase contrast imaging with coherent x-rays can be distinguished in outline imaging and holography, depending on the wavelength {lambda}, the object size d and the object-to-detector distance r. When r << d{sup 2}{lambda}, phase contrast occurs only in regions where the refractive index fastly changes, i.e. at interfaces and edges in the sample. With increasing object-to-detector distance we come in the area of holographic imaging. The image contrast outside the shadow region of the object is due to interference of the direct, undiffracted beam and a beam diffracted by the object, or, in terms of holography, the interference of a reference wave with the object wave. Both, outline imaging and holography, offer the possibility to obtain three dimensional information of the sample in conjunction with a tomographic technique. But the data treatment and the kind of information one can obtain from the reconstruction is different.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- OSTI ID:
- 525910
- Report Number(s):
- LBNL-40112; CONF-9608146-; ON: DE97005928; TRN: 97:015070
- Resource Relation:
- Conference: Workshop on x-ray computed microtomography (CMT), Berkeley, CA (United States), 12-13 Aug 1996; Other Information: PBD: Feb 1997; Related Information: Is Part Of Proceedings of the workshop on high resolution computed microtomography (CMT); PB: 437 p.
- Country of Publication:
- United States
- Language:
- English
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